Do the maintenance on a heat pump. During the maintenance I made sure that the drain lines were clear and draining properly. Also checked temperatures and pressures outside by the condenser and everything checked out. Did an amp reading on the heat pack to ensure that it is working. Customer swap filter. I clean the blower motor housing.customer has really old humidifier I would recommend to replace it. System is operating properly at this time. M#Fcm4x6000al s#A150283557